1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 1ca21d2ba11c..84eedc965688 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -33,6 +33,11 @@ pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
         u32 new, check, mask;
         int reg;
 
+        /* Ignore resources for unimplemented BARs and unused resource slots
+           for 64 bit BARs. */
+        if (!res->flags)
+                return;
+
         pcibios_resource_to_bus(dev, &region, res);
 
         pr_debug("  got res [%lx:%lx] bus [%lx:%lx] flags %lx for "
@@ -67,7 +72,7 @@ pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
 
         if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
             (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
-                new = 0; /* currently everyone zeros the high address */
+                new = region.start >> 16 >> 16;
                 pci_write_config_dword(dev, reg + 4, new);
                 pci_read_config_dword(dev, reg + 4, &check);
                 if (check != new) {